The main character from the Xbox and PC game Halo. As a boy, named John, he was captured along with several other children by an organizations who's goal is to train kids to be super soldiers by their late teens. John, along with 20 some other "Spartans" passed the training and have fought some of the most amazing battles known to man.
The Master Chief walked into the bar and sat down. Then he pulled out a deagle and shot everyone in the head.